The SILC Project (SiLC:Silicontracking for the InternationalLinearCollider) The SILC Project (SiLC: Silicon tracking for the International Linear Collider) Aurore Savoy-Navarro, LPNHE-UPMC/IN2P3-CNRS on behalf of the SILC R&D Collaboration (with material from last SiLC meeting in Vienna) JORNADAS SOBRE EL FUTURO COLISIONADOR LINEAL Palacio Ducal, GANDÍA, 1 al 3 de Diciembre al 3 de Diciembre 2005

R&D on Si Trackers WHHHHYYYYYY ? ? Volume 45-9: Nov 2005 A lot to be already learned from LHC!

But material budget is not the ONLY reason

The SILC R&D Collaboration U.S.A Michigan U. SCIPP-UCSCEurope IMB-CNM/CSIC, Barcelone (SP) (eudet ass.) Geneva U, Geneve (CH) Helsinki U. (Fi) (eudet) IEKP, Karlsuhe U. (D) Moscow St. U., Moscou(Ru) Obninsk St. U., Obninsk (Ru) LPNHE, Paris (Fr) (eudet) Charles U., Prague (CZ) (eudet) IFCA, Santander(Sp) (eudet) Torino U., Torino (It) IFIC-CSIC Valencia (Sp) (eudet ass.) IHEP, Academy Sci., Vienna (Au) Asia Kyungpook U. Taegu, Ko Yonsei U., Seoul, Ko Korea U. Seoul, Ko Seoul Nat. U., Seoul, Ko SungKyunKwan U. Seoul Tokyo U. (Japan) HAMAMATSU (Japan) Close connections:  FNAL (DOE prop 05 funded)UCSC, FNAL, LPNHE  SLAC (DOE prop 03: funded): UCSC, SLAC Michigan U, LPNHE and meetings SiD  CERN (developed interest) Launched January 2002, Proposal to the PRC May 2003, Report Status May 2005, Several contracts of collaborations between Institutes, ex: HPRN-CT , CICYT-IN2P3, IN2P3-Hamamatsu, DOE proposals, EUDET Collaboration still growing. (underlined are the contracts/ proposals including spanish teams in SiLC)

R&D Goals Very high precision on momentum (x10 better) & spatial measurements (down to 4µm, in certain regions, average 7-8 µm), large angle coverage. Low material budget Robustness Easy to build and to work with Low cost SiLC is a generic R&D collaboration to develop the next generation of large area Silicon Detectors for the ILC; It applies to all the detector concepts and indeed gathers teams from all 3 detector concepts:  SILC R&D offers a unique framework to compare tracking performances between the various detector concepts.  Main difference between the detector concepts = tracking system SiD GLD LDC

To achieve these goals:  R&D on sensors  R&D on Electronics  R&D on Mechanics together with developing the appropiate tools:  Test benches  Calibrations and Monitoring  Simulations  Test Beam

R&D on Sensors  Silicon strips are the baseline with: Larger size wafers, single and double sided Thinner/Thinning Smaller pitch High yield Eventually different shapes Possibility to use new technos in some regions:  Possibility to use new technos in some regions: Pixelization: Pixels, DEPFET, MAPS/FAPS, SOI In order to achieve this R&D:  Lab test bench for full characterization of the sensors (most Labs in SiLC) with a continuous upgrade.  Fabrication line for new ideas on sensors at various Institutes (Korean Institutes, Helsinki U., IMB-CNM/CSIC)  Process Quality Control and sensor characterization (Vienna, Karlsruhe, Korea, Helsinki)  Medium size fab line for small size production (looking at different such places, in Europe and Asia for the time being)  Transfer to Industry for full production (presently Hamamatsu but could evolve).

1)Tests & results on Si strips Same amplitude for L=28 up to 112 cm with Tsh=3.7µs VA64_hdr Tsh=3.7µs Variable lengths: 28cm x N=1,4 Built by Geneva U. Paris test bench

Sr 90 Source tests Paris-Prague Pedestal and common mode subtraction Signal spectrum summed over a cluster MPV: 51 mV Mean: 79 mV Noise: 2.6 mV 28 cm56 cm MPV: 55 mV Mean: 83 mV Noise: 4.6 mV Pedestal and common mode subtraction Signal spectrum summed over a cluster 112 cm 224 cm

Sr 90 Source tests (Paris-Prague) Noise scales with strip length: ENC~20 e/cm S/N drops below 10 for 224 cm Noise optimisation of the setup needed Improved FE electronics (here VA_64hdr) (Z. Dolezal & F. Kapusta,Vienna’05) NEW & Preliminary

Several Institutions in SILC are developing new sensor research lines (IMB-CNM/CSIC, Helsinki, SiLab, Korea) Strategy:  The research Labs develop & test new ideas  transfer to small fabs for reduced prod.  Large production, high quality and reliability: HAMAMATSU Monopoly 2) R&D on new sensors

N-side P-side wafer TOPSIL (5inch, high resistivity, (100), FZ, DSP) strip width 9m9m strip pitch 50(100)  m thickness 380  m readout pitch 50  m size51 x 26 mm 2 readout channel512(512) Prototype DSSD Designed, Fabricated and Tested: - IV/CV shows good quality sensor - S/N shows that the sensors are in good shape - more tests are in progress - will fabricate AC-SSD on 6-inch(400 mm) and 8-inch(500 mm) wafers S/N=25 KOREANTEAM

3) Quality Control: Sensor Test Setup 3) Quality Control: Sensor Test Setup courtesy of Thomas Bergauer (HEPHY Vienna) Light-tight Box, Instruments, Computer vacuum support carrying the sensor –Mounted on freely movable table in X, Y and Z Needles to contact sensor bias line –fixed relative to sensor Needles to contact: –DC pad (p + implant) –AC pad (Metal layer) –Can contact ever single strip while table with sensor is moving

Example Measurements: Stripscan After IV-CV ramp, bias voltage is adjusted to stable value (e.g. 400 V) and stripscan is started 4 parameters tested for each strip: –dielectric current I diel –coupling capacitance C ac –poly-silicon resistor R poly –strip leakage current I strip For each test, the switching matrix has to be reconfigured –Full characterization of detector with 512 strips: 3h

TS-CAP sheet GCD CAP-TS-AC babydiode MOS in MOS out Standardized Set of Test Structures Company test-structures “Standard Half moon” with 9 different structures adressing all important sensor characteristics

Summary Future experiments with large tracker require huge number of sensors. –CMS Si Tracker: 206 m 2, sensors, channels Fabrication will last many months (years) and a stable production during the whole production time is mandatory. Strip-by-strip test of detectors is necessary but not sufficient –Slow, reduced set of parameters to test Measurements on dedicated test-structures is a powerful possibility to monitor the fabrication process –During a long production time –Also on parameters which are not accessible on the main sensor (e.g. MOS) –Destructive tests possible –Fast measurement allows high throughput Test structures must be optimized by improving with Smaller structures Better design of some structures (e.g. diode, sheet) To put it on unused space of their wafer design

Si detector simulation: important for the sensor & electronics studies and to include in G4 simu for detector studies (ex: IMB-CNM, Helsinki, Karlsruhe, Prague, Paris) Si detector simulation: important for the sensor & electronics studies and to include in G4 simu for detector studies (ex: IMB-CNM, Helsinki, Karlsruhe, Prague, Paris) ISE-TCAD, TMA, Silvaco Technology simulation Electrical simulation –Charge collection –charge sharing in 3D or: G4 simu

R&D on Electronics The Si tracking system includes: a few 100m 2, a few 10 6 strips Events tagged every bunch (300ns) during the overall train (1 ms) Data taking/pre-processing ~ 200 ms Occupancy: < a few % Requested features for FE chip: Low noise preamplifiers Shaping time (from 0.5 to 5 µs, depending the strip length) Analogue sampling Highly shared ADC sparsification Very low power dissipation Power cycling Compact and transparent Choice of DSμE & go to VDSM First LPNHE prototype fulfills most of these requirements Other electronics issues: Time measurement Calibration/Monitoring of the electronic chain Connectics Cabling Integration into DAQ Data taking/pre-processing On detector Outside detector Bunch tagging Discussed at the SiLC Meeting, Vienna Nov. 18th

Front-End chips under design (Courtesy of Jean Fran ç ois Genat, LPNHE) SLAC Calorimetry and tracking (submitted to MOSIS 0.25µ, Oct 24) Charge: linear 1 or 2-gains, 2500 MIPS Shaping: reset-sample (2-correlated sampling like) Time: BC id UC Santa Cruz Tracking Charge: Time Over Threshold, Lo+Hi thresholds, 128 MIPS Shaping:  s Time: BC id LPNHE Paris Tracking Charge: linear, multiple sampling including pedestal, 50MIPS Time: 2-scales BC id 1-10 ns timing (long. coordinate over strips)

Present Si tracker FE designs SCIPP-UCSC: Double-comparator discrimination system  Charge by TOT  Improve spatial resolution (25%) 2nd Foundry: May 05, arrived August 05 LPNHE-Paris: Analogue sampling+A/D, including sparsification on sums of 3 adjacent strips. Deep sub micron CMOS techno. First chip successfully submitted Fully tested Next version: in progress

Expected Performance for time measurements Two different designs must be considered wrt the time scale to be achieved: Time stamping (order of 30 to 50 ns) Fine time measurement (~ 2 to 5 ns) Preamp + shaper + sampling have to be designed accordingly. This will impact the performance on power dissipation and technology choice. Currently investigated both on Lab test-bench and simulations Simulated time resolution using multiple sampling and least square fit algorithm (J.F. Genat)

Paris Front-end Prototype Chip Low noise amplification + pulse shaping Pulse sampling Threshold detection Power dissipation less than 500  W/ch. Technology: CMOS 180 nm Sent Nov 2004, received February 2005 Preamp CR RC Shaper Follower Comparator 16 identical channels 3mm

Preamp results Gain: 8mV/MIP OK Dynamic range: 50 MIP OK Linearity: +/-1.5% expected: +/-0.5% - 70  W power, 3  s-20  s rise-fall times: e-/pF e-/pF expected OK

Shaper results Peaking time: 2-6  s tunable peaking time vs 1-10 expected - Linearity: 6%, 3.5% expected - 3  s shaping time and 70  W power: e-/pF vs e-/pF expected OK

Measured Shaper output Small oscillations at the shaper output mainly due to packaging parasitics 325 e- input noise for 280 simulated with chip-on-board wiring Measured waveform as expected Packaged chip Bare chip on board

Process spreads (CMOS 180 nm) Process spreads: 3.3 % quite good Preamp gain distribution (Preamp + shaper) power distribution First foundry in 180 nm: quite successful and very well tested

128 channel chip UMC 130 nm CMOS techno with sampling included; 2nd chip prototype under design, submission Sept 06 (preproto 4-8 channel-chip, submitted March 06). Will equip the test beam prototypes Second LPNHE FE chip prototype: underway analogue

R&D on Mechanics concentrates on:  CAD design of Si tracking components: essential for baseline design studies of detector concepts  Elementary module design in close collaboration with FE electronics designers  Large structure: robust, light, easy to build  Materials  Positioning & alignment  Cooling  Robotisation & Industry transfer  Integration issues For all these items new solutions must be found

Silicon Envelope surrounding TPC SiD: all Si-tracker TPC volume 4 4 Si tracking components in detector concept with TPC internal and external Si tracking components in barrel and large angle (forward/end caps) regions, acting as intermediate trackers and forming a complete coverage Si tracking system How it compares with SiD tracker? Si tracking components in a detector with central TPC

Barrel Internal barrel + forward TPC µvertex zone SIT zone FTD zone Thermal insulation 30 cm Microvertex zone includes: µvertex + 2 disks with same pixel technology SIT zone includes: 2 or 3 Si layers + 2 disks strips and /or pixel techno FTD zone includes: at least 3 more disks extending from 60cm to 150cm or up to the end of TPC length with eventually more disks The ensemble {µvertex + SIT +FTD} is inside a thermal insulation (under study) Nb of layers and disks & preferred techno are being studied (preliminary simulations studies: M. Berggren) Tiles vs Ladders ? SET if TPC ? How? CAD & main issues for Si components: detector design & performances

Ø203 mm ~405m m 270m m 230m m 59mm 104m m ~117m m ~157m m sens or Projective XUV …….. FE electronics foam Si + support EndCapTk Ladders with 3 or 2 sensors Outer ECT layers: Projective vs XUV ? Nb of layers? How to arrange them? (simu studies) How many layers? If TPC: layers set up? TPC+ Si &/or Calo + Si Level arm?(simu studies) ~1 – 1.3 m Mechanical team LPNHE-Paris

Elementary modules: to be totally revisited! Ladder with 1 to 3 sensors 0.7%X0 Next step = chip inserted onto the detector: connectics/VDSM/cabling issues (study starting: see SiLC meeting) Modules: light, precise, robust, easy to build & assemble New sensors (next generation) Support: materials & design FE electronics connectics, packaging and cabling Module positioning on large size support structure Easy to build (robotisation ?) Industry Transfer (large #) Universal sensor vs diff. types Be innovative! N.B. This is just a very first ladder prototype: just a very preliminary exercise… By no means what will be the final one!! Old fashioned FE electronics!!

Enlightening talk by Manolo Lozano meeting

AMS handmade ladder production line Automatized Automatized production line at CMS Starting point: both expertise exist within SiLC; Need to be further developped Robotic assembly Probe station LADDER PRODUCTION LINE: examples Geneva University & ETH Zurich

LIGHT COOLING (?): Thermo mechanical studies External Temp: 45°C Si detector temp: 30°C Cooling water Temp: 20°C Cu screen: ~25°C 1h2h8h Temp. probes Foam insulator & cooling screen (high module C fiber) with water cooling is OK (LPNHE-Paris)

Alignment(s) Two techniques are so far developed in the collaboration:  Frequency Scanned Interferometry (FSI) (quite advanced) Precision below 1µm by the University of Michigan Embedded Straightness Monitor (just starting) by the IFCA-Cantabria University (EUDET) To ensure the challenging high precision performances of the Silicon tracking system in an ILC experiment, one crucial key issue is the alignment

Embedded straightness monitor - Conceptual Design (courtesy, C. Rivero & I. Vila) Collimated laser beam (IR spectrum) going through silicon detector modules. The laser beam would be detected directly in the Si-modules. Based on previous AMS-1 experience we can project that few microns resolutions would be achieved. Main advantages: –Particle tracks and laser beam share the same sensors removing the need of any mechanical transfer. –No precise positioning of the aiming of the collimators. The number of measurements has to be redundant enough

Embedded straightness monitor - Initial R&D IR Laser assembly Optically treated silicon modules Imaging/Power detector –Silicon module surface requires special treatement to improve its optical quality –From an optical point of view the silicon wafer will behave as a plane parallel plate. –Dedicated ultra-stable test stand for “optical” characterization of the modified silicon modules: reflectivity, transmitance, absorption, polarization sensitivity, wedge effect, response uniformity... Ultra-stable Survey network

Embedded straightness monitor - Initial R&D Start up plan: –Study/selection of precise laser wavelength(s)* adequated to the Si module sensibility. – Small laser test stand for Si-mod readout: determine spatial resolution achievable. – Study of feasibility of optical treatment of the Si wafer. (*) Using more than one wavelengths may allow us to correct for “atmosferic” effects that will deflect the laser beams.

SIMULATIONS G4 geometry of the Si Envelope (V. Saveliev, Obninsk St U.) Ext. FWD Ext. FWD Ext Barrel Int. Barrel+FWD DB description in G4 thanks to the detailed CAD Occupancies calculated with BRAHMS full simulation (Si-Envelope+TPC), Higgstrahlung HZ with bbbar and q qbar at Ecm=500 GeV Values at most of order a few% for the hotest places in the detector! Thus medium size ladder looks to be appropriate.

Higgs event in the SiD detector design, using MOKKA G4 framework SiD detector included in geometry DB (V. Saveliev) A lot of work performed with fast but enough detailed simulation (SGV): See talk by M. But dramatically lacking a full reconstruction program in the G4 framework for complete detector concept studies. SiLC meeting-Vienna to make a WW effort for Si tracking G4 reconstruction (meeting Dec 15th)

Test beams: Goals  To qualify in conditions closest to the real life: prototypes of detectors (including New Si technologies) and of the associated FE and readout electronics.  Detection efficiency vs operational parameters  Spatial resolution, cluster size  Signal/Bruit  Effect of magnetic field (Lorenz angle determination)  Angular scans, bias scans  Integration with other sub-detectors  Alignment  Cooling (including power cycling)  In the specific & new ILC conditions.

Detector Prototypes: Support mobile Design (just started) Fabrication Assembling & Mounting Module with 3 sensors Module with 2 sensors Second layer partly covering the first one. Total of 60 trapezoidal sensors, About 10 K readout channels Ready by end 2006/beg Other prototypes: Ladders of different sizes and sensors Forward Prototype: under CAD study

Test beam schedule (SiLC-EUDET) Preparation: Construction barrel prototype New foundry (>=512 ch + techno) Preparation: Endcap Prototype with 128 channels (130 nm CMOS-UMC) DESY CERN? CERN or FNAL? Preparation Ladders+ FE tests 2 ladders, 1st proto chips Tests End Cap proto(s), with 2nd foundry chips Tests barrel proto also combined with other sub detectors and new foundry These coming 4 years: 2006 to 2009 will be essential to the development of this R&D: the test beams will be instrumental to test new ideas and new prototypes on all the different aspects of this R&D (sensors, electronics, & mechanics). Look for combined test with other subdetectors. Synergy with LHC now and for future upgrade.

GOAL of SiLC R&D to develop the next generation of large area Si trackers with high performance in spatial and momentum measurements at ILC. All R&D aspects on: SENSORS, ELECTRONICS & MECHANICS All needed tools: SIMULATIONS, ALIGNMENT & CALIBRATIONS. Highlights/important progress these last 2 years:  Sensors: characterization of variable length strips, New Fab Lines  FE electronics in Deep SubMicron CMOS techno  CAD of all tracking components both for LDC (Si Envelope) & SiD  Thermo mechanical studies THESE NEXT FOLLOWING YEARS, PRIORITIZED R&D OBJECTIVES:  Sensors: larger, thinning, pixelization, Fab Lines.  Electronics: VDSM FE readout + Connectivity + DAQ processing  Mechanics: New materials,realistic CAD components, integration, protos  Alignment/position monitoring and Cooling  G4-based simulations  Test beams: getting closer to real life conditions & combined tests with other major subdetectors (microvertex, calorimetry & TPC SI/NO)  Collaboration & close contacts with all 3 detector concepts KEEPING SYNERGY with LHC (SuperLHC).